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 MSA  Vol.3 No.12 , December 2012
Effect for Inhomogeneity by Pb Substitution on (Bi1-yPby)2Sr2Ca1-xYxCu2O8+δSingle Crystals
Abstract: Inhomogeneity is one of the most important problems for the investigation of the superconductor-insulator transition. Y and Pb co-doped Bi2Sr2CaCu2O8+δ(PbY-Bi2212) crystals were fabricated by the self-flax method in order to control both carrier density and dimensionality. The Y-content of PbY-Bi2212 crystals was much wide distributed in the same crucible rather than that of only Y doping Bi2212 (Y-Bi2212) crystals. In order to clear the origin of inhomogeneity, crystals were characterized by wavelength-dispersive X-ray spectroscopy (WDS) and X-ray diffraction (XRD). One can estimate the Y-content of cleavage samples from the c-axis lattice parameter obtained by XRD because mainly Y-con- tent affects to c-axis lattice constant for both Y-Bi2212 and PbY-Bi2212 crystals. It found that there are some samples with multi-phases and the ratio of samples with multi-phase for PbY-Bi2212 crystals is larger than that for Y-Bi2212 crystals. The linear relation between Y-content and Pb-content were also found from WDS. Large inhomogeneity of Y-content may be induced from Pb-content inhomogeneity. Transport properties are strongly dependent to Y-content. However they cannot be explained only from the macroscopic chemical compositions of the substitution atom Y and Pb. It may be related to microscopic inhomogeneity.
Cite this paper: S. Komaki, Y. Kourogi, T. Murano, A. Furushima, S. Maeda, Y. Sawada, B. Saya, Q. Meng, T. Tsuneoka, F. Ichikawa and K. Itoh, "Effect for Inhomogeneity by Pb Substitution on (Bi1-yPby)2Sr2Ca1-xYxCu2O8+δSingle Crystals," Materials Sciences and Applications, Vol. 3 No. 12, 2012, pp. 829-832. doi: 10.4236/msa.2012.312120.
References

[1]   A. M. Goldman, “Superconductor-Insulator Transitions in the Two-Dimensional Limit,” Physica E: Low-Dimensional Systems and Nanostructures, Vol. 18, No. 1-3, 2003, pp. 1-6. doi:10.1016/S1386-9477(02)00932-3

[2]   A. M. Goldman, “Superconductor-Insulator Transitions,” International Journal of Modern Physics B, Vol. 24, No. 20-21, 2010, pp. 4081-4101. doi:10.1142/S0217979210056451

[3]   V. F. Gantmakher and V. T. Dolgopolov, “Superconduc tor-Insulator Quantum Phase Transition,” Physics-Uspekhi, Vol. 53, No. 1, 2010, pp. 1-50. doi:10.3367/UFNe.0180.201001a.0003

[4]   K. Semba and A. Matsuda, “Superconductor-to-Insulator Transition and Transport Properties of Underdoped YBa2Cu3Oy Crystals,” Physical Review Letters, Vol. 86, No. 3, 2001, pp. 496-499. doi:10.1103/PhysRevLett.86.496

[5]   Y. Fukuzumi, K. Mizuhashi, K. Takenaka and S. Uchida, “Universal Superconductor-Insulator Transition and Tc Depression in Zn-Substituted High-Tc Cuprates in the Underdoped Regime,” Physical Review Letters, Vol. 76, No. 4, 1996, pp. 684-687. doi:10.1103/PhysRevLett.76.684

[6]   F. Ichikawa, et al., “Magnetoresistance in a Nd2-xCexCuO4 Thin Film below Tc,” Solid State Communications, Vol. 98, No. 2, 1996, pp. 139-142. doi:10.1016/0038-1098(96)00005-1

[7]   K. Makise, et al., “Temperature dependence of the Hall angle in disordered Y1-xPrxBa2Cu3O7-δ Thin Films,” Physica C: Superconductivity, Vol. 388-389, 2003, pp. 337 338. doi:10.1016/S0921-4534(02)02489-9

[8]   S. Komaki, et al., “Relation between Inhomogeneous Structure and Transport Properties for Superconductor-Insulator Transitions,” J. Phys. Conferences Series, Vol. 150, Part 5, 2009, 052117. doi:10.1088/1742-6596/150/5/052117

[9]   C. Kendziora, et al., “Composition, Structure, and Electrical Properties of Bi2Sr2Ca1-yYyCu2O8: A Single-Crystal Study,” Physical Review B, Vol. 45, No. 22, 1992, pp. 13025-13034. doi:10.1103/PhysRevB.45.13025

 
 
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